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Hot Water Recirculation Systems

A pump rapidly moves water from a water heater to the fixtures

ORNL: Evaluation of Residential Hot Water Distribution Systems by Numeric Simulation
The goal of this project was to simulate and compare the energy and water performance, economics, and barriers to use of various domestic hot water distribution systems in new and existing California residences, and to evaluate the potential statewide impact of the use of more efficient hot water distribution systems.
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Disclaimer: The information on the system, product or material presented herein is provided for informational purposes only. The technical descriptions, details, requirements, and limitations expressed do not constitute an endorsement, approval, or acceptance of the subject matter by the U.S. Department of Housing and Urban Development (HUD/FHA), The Partnership for Advancing Technology in Housing (PATH), or any PATH-affiliated Federal agency or private company. There are no warranties, either expressed or implied, regarding the accuracy or completeness of this information. Full reproduction, without modification, is permissible.